Starting device for spray bar applying bituminous materials to highways



Aug. 28, 1956 H. A. CARTWRIGHT 2,760,818

STARTING DEVICE FOR SPRAY BAR APPLYING BITUMINOUS MATERIALS TO HIGHWAYS 2 Sheets-Sheet 1 Filed Oct. 19, 1953 Aug. 28, 1956 H. A. CARTWRIGHT 2,760,818

STARTING DEVICE FOR SPRAY BAR APPLYING BITUMINOUS MATERIALS TO HIGHWAYS Filed Oct. 19, 1953 2 Sheets-Shem 2 United States Patent STARTING DEVICE FOR SPRAY BAR APPLYING BITUMINOUS MATERIALS TO HIGHWAYS Horace A. Cartwright, Birmingham, Ala., assignor to Cartwright Industries, Inc., Birmingham, Ala., a corporation of Alabama This invention relates to a mechanical starting device for spray bar applying bituminous materials to highway surfaces. It has for its main objects to provide such a device that will be highly satisfactory for the purpose intended, simple in structure, comparatively cheap to manufacture, easy to use, and extremely durable.

Other objects and advantages will appear from the drawing and description.

In the application of bituminous materials to highway surfaces it is important to maintain a uniform rate of application. This is usually accomplished by setting the bituminous pump speed to deliver a given quantity of bitumen per minute. This procedure cannot be followed where joints between succeeding applications occur. It is not possible to have the nozzles start spraying exactly where the nozzles ceased spraying the previous application. For instance, if the spraying truck speed were six hundred feet per minute, the truck is traveling 10 feet per second and to throw the operating lever to the on position to start within A" of the correct starting line would require the operator to catch the correct time within $4 of a second. There are two methods generally used. One is to let succeeding applications lap previous applications. Additional cover material sticks where the lap is, making a hump in the road surface. Another method is to place paper over the cover material at the joint and have the spray begin on the paper and only hit the road surface at the edge of the paper and beyond the previous application. This method eliminates the lap but due to the fact that the truck speed is less than required, the application is heavy and extra cover material can bed in the bitumen. It is impossible in only about two feet to get the truck speed up to the required rate, and if the truck speed is only half the speed required, twice the correct amount of bitumen is applied at this point. This extra bitumen can also result in a rich section that can be slippery if not blotted out. The paper requires laying, picking up, and disposal.

The spray starter described herein makes it possible to secure a perfect joint when used with a spray bar (no part of this invention and not shown) having nozzles that all start instantly on a straight line and also cut off clean on a straight line. It is simple to operate and requires no air, and no device has to be set on the road which the truck may miss.

By referring generally to the drawings it will be observed that Fig. 1 is a plan view with part in section of a starting device made according to this invention mounted on a spray bar attached to a truck frame that carries a bitumen tank; Fig. 2 is a side elevational view of the parts shown in Fig. 1; Fig. 3 is a plan view with part in section of the same parts as shown in Fig. 1 but in a different position; Fig. 4 is a side elevational View of the parts shown in Fig. 2 but in a different position; and Fig. 5 is a detail view of the spring loaded operating lever of the spray bar which is no part of this invention and not shown.

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Similar reference numerals refer to similar parts throughout the several views.

Referring to the drawings in detail it will be seen that the spray bar starting device comprises a wheel 1, having a threaded sleeve 2 in the hub of the wheel. A disc 3 is attached on the hub with a lug 3 on its outer face. These parts rotate together. A screw axle 4 is threaded in sleeve 2. An arm 5 contacts lug 3 on disc 3 when sleeve 2 is screwed all the way out on screw axle 4. A hub 6 is pinned to screw axle 4. A ring 7 is rotatable on hub 6'except when cap screws 8 and washers 9 prevent rotation. Screw axle 4, arm 5, hub 6 and ring 7 rotate together in operation. A cover 10 is over the upper portion of the wheel 1. Ring 7 has a square notch 11 which holds a lug 12 on arm 13 in the set position with arm 5 contacting the lug 3 Arms 14 and 15 operate arm 16. Arm 16 prevents lever 17 from moving under pressure exerted on the operating lever 18. In operation the truck is backed into a position with the pointer 19 over the desired starting point. The screws 8 are loosened and hub 6 is turned thereby screwing the wheel 1 towards the operator until movement is stopped by the arm 5 striking the lug 3 A roller 20 is held by arm end 21 and ring 7 is turned to the position shown with dog lug 12 in place. Screws 8 are now tightened and the starter is set. The truck now may be backed several feet to obtain a running start. The wheel backs up on the screw. When the truck moves forward again the wheel turns 'on the screw. The operator pulls the lever 18 and when the wheel reaches its original position the lug 3 on disc 3 engages the arm 5 thereby rotating hub 6 and ring 7 and jerking arm 13 so that arm 16 and roller 20 cease to hold arm end 21 against the force exerted on the operating lever 18 by spring 18 and the nozzle suddenly open. The distance the wheel backs up exactly equals the distance it moves forward before tripping the operating mechanism. The pointer 19 is adjustable to compensate for varying truck speeds. There is a slight time lapse between the nozzles opening and the spray hitting the road surface. It also takes a fraction of a second for the nozzles to open.

From the foregoing it will appear that the device is intended to control the opening of the spray nozzles at a fixed place on the road surface.

The various parts of the device may be made of any material suitable for the purpose. Also the parts may be made in different sizes and capacities, depending on how and where to be used.

While I have shown and described the preferred embodiment of my invention, I do not wish to limit same to the exact and precise details of structure, but reserve the right to make all modifications and changes so long as they remain within the scope of the invention and the following claims.

Having described my invention I claim:

1. A device attached to and in combination with a truck frame for starting a spray bar at a predetermined place on a road surface comprising an axle mounted in the frame of a truck, said axle having screw threads thereon, a threaded sleeve mounted upon said threaded axle, a wheel mounted upon said sleeve, said sleeve having threads in its inner wall of a size to fit upon and travel the threads of the axle, a lug attached to the side edge of the wheel, a hub attached to the said axle, an arm attached to said hub and adapted to make contact with said lug when the wheel is revolved, a disc attached to the outer face of said hub, a ring mounted on the outer face of said disc with cap bolts and washers adapted to hold said ring on the disc in different positions, an arm swingably attached by one end thereof to the truck frame near said disc and ring, a bar pivotally attached to the other end of said swingable arm, an arm attached in adjustableposition horizontally at the free end of said-pivotally attached bar, a roller mounted in one end of said horizontally attached arm, a lever bar mounted on said frame and adapted to make contact with the roller when the lever bar is in one position and to be free from the roller in another position, said parts on the wheel and hub being means adapted for the two positions of the roller, the free end of said lever bar being adapted for connection to a spray bar with a plurality of nozzles adapted to be opened and closed; a pointed arm as a guide attached to said truck frame, said guide being adapted to indicate the position on a highway surface for said starting parts to operate as a result of the setting of the said lugs and bars of the parts.

2. A device in combination with part of a truck frame for automatically starting a spray bar at a predetermined place on the surface of a highway comprising, an axle mounted in the frame of a truck base, said axle having screw threads on part of its face, a threaded sleeve mounted upon said threaded axle, a wheel mounted upon said sleeve in fixed position, said sleeve having screw threads in its inner face of a sizeto fit upon and travel the threads of the axle, a lug attached to the side outer edge of the wheel, a hub attached to said axle in fixed position, an arm attached to said hub and adapted for its outer end to. make contact with said lug on the wheel when the wheel is revolved, a disc attached to the outer face of said hub, a ring mounted on the outer face edge of said disc, a plurality of cap screws and washers adapted to hold said ring on the disc in different positions, an arm swingably attached by one end thereof to the truck frame portion near said disc and ring, a bar pivotally attached to the other end of said swingable arm, an arm attached in adjustable position horizontally on the free end of said pivotally attached bar, a roller mounted in one end of said horizontally attached arm, a lever bar mounted on said truck frame and adapted to make contact with the said roller when the lever bar is in one position and to be free from the roller in another position, said parts consisting of the wheel and axle and sleeve and connecting arms and bars being means adapted for the two positions of the roller, the free end of said lever bar being adapted for, connection to a spray bar having a plurality of nozzles adapted to be opened and closed; a pointed arm as a guide attached to said truck frame, said guide being adapted to indicate the position on a highway surface for said parts to start to operate as a result of adjusting said wheel on the threaded sleeve and adjusting the arms, bars, and lugs.

References Cited in the file of this patent UNITED STATES PATENTS 1,405,417 Jansson Feb. 7, 1922 2,357,930 Clark Sept. 12, 1944 2,436,419 Cartwright Feb. 24, 1948 

